Magnetic stirrer



FIG. 1 is a top and side perspective view of a magnetic stirrer of the present invention.

FIG. 2 is a side elevational view of the magnetic stirrer of FIG. 1;

FIG. 3 is a top elevational view of the magnetic stirrer of FIG. 1; and,

FIG. 4 is a bottom elevational view of the magnetic stirrer of FIG. 1.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a magnetic stirrer, as shown and described. 